Door-bell and burglar-alarm



(No' Mode-1.)

J. T. STONE. DOOR BELL AND BURGLAR ALARM.

No. 530,666. Patented D60. 11, 1894.

UNITED STATES PATENT OF ICE.

JOHN T. s'roNE, oF OAKLAND, CALIFORNIA.

DOOR-BELL AND BU RGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 530,666, dated December 11, 1894. Application filed May 28, 189 Berial No. 512,683. (No model.)

To all whom it may concern.-

Be it known that I, JOHN T. STONE, a citizen of the United States, residing at Oakland, county of Alameda, State of California, have invented an Improvement. in Call, Door, and Alarm Bell Signals; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to call, door and alarm signals,and it consists of the constructions and combinations of devices hereinafter described and claimed, and'explained by reference to the accompanying drawings, in which- Figure 1 is a sectional view taken parallel with the plate, showing the interior mechanism of the device. Fig. 2 is a section taken through the door and the longitudinal axis of the .bell and spindle.

ing the attachment of a bell at a distance from the edge of the door. Figs. 4 and 5 show the application of the device as a window alarm. i

The object of my invention is to provide a simple, cheap and easily operated mechanism which may be attached to doors or windows in such a manner that the opening of either would instantly set the mechanism in motion and by strokes upon the bell. give an alarm to show that the door or window is being moved; and in conjunction with this of a supplemental mechanism operating upon the same bell whereby it may be used, when connected with the door, as a simple door or call bell, independent of the automatic mechanism.

A is the main plateto which the bell B is attached by a central post 0, and a locking nut D or other suitable device whereby it is easily secured to or removed from the plate A.

The plate A is made with flanges bent at right angles and adapted to rest againstthe door or other part E to which it is to be attached, so that a space will be left between the central portion of the plate A and the door for the introduction of mechanism connected with the call portion of the apparatus to be hereinafter described.

The plate A is secured to the door by any suitable or desireddevice, which will'hold it properly in place.

Upon the central spindle G is journaled an Fig. 3 is a view showescapement wheel J. When this wheel is rotated an esc'apement K engaging with the teeth of this wheel, is caused to oscillate, and it carries with it the arm L upon which the hammer M is secured so as to cause the hammer M to strike against the inner surface of the bell at each oscillation of the escapement,

and give a continuous alarm as long as it is in motion.

N is a pinion fixed to turn with the escapement wheel J upon the central spindle.

O is a gear-wheel engaging the pinion N, and fixed upon a shaft upon which a ratchetwheel Q and a pinion P turn loosely.

R is a spring pawl attached to the gear-- wheel 0 having its point engaging the ratchetwheel Q, so that when the ratchet-wheel and pinion P are turned in one direction, the pawl will move freely over the ratchet teeth withoutturning the gear-wheel O, and its engaged pinion N which carries the escapement wheel. When turned in the other direction, the pawl will engage the ratchet teeth and will thus cause the gear 0 to be turned with the ratchet and the pinion P, and thus move the escapement.

S is a segmental rack having teeth upon its outer periphery which are adapted to engage the teeth of the pinion P. This rack is curved T, while the end'projects beyond the fulcrum .point and is connected with a lever V by a link U. The lever is fulcrumed between its opposite ends as shown at W so that it lies diagonally with the vertical edge of the door, and has its opposite end which forms the short arm of the lever, so formed as to engage the door jamb, and it is turned about its fulcrum point as followsz-When the door is closed,

this end of the lever V is pressed against the jamb and turned about its fulcrum, so that its opposite end draws upon the extension or shank of the segmental rack S with which it is connected below its fulcrum point. This moves the rack and causes it, through its ongagement with the pinion P, to turn the latter and the ratchet Q around the shaft, the pawl R moving freely over the teeth of the ratchet so that the gear-wheel O is not rotated. The parts are now set in position to be operated l l l shank of the segmental rack S, and acts to pull the segmental rack back to its normal or first position. This now turns the pinion P and the ratchet Q and through the pawl R which engages the teeth of the ratchet, the gear 0 is also caused to rotate. This gear engages the pinion N and turns it and with it the escapement wheel J which, operating upon the escapement K and the hammer M, causes the latter to strike the bell rapidly and as long as the movement of the parts takes place or until the segment S has reached the end of its stroke, and the lever-V has turned about its fulcrum as far as it can go. lVhenever the door is again closed, the reverse movement of the lever V takes place as previously described, and the parts are set for another operation.

I have found by experience that it will be impossible in many cases, especially where the door hinges are short, to provide a sufficient movement to operate the mechanism and give a sulficient number of strokes upon the bell to properly call attention to it, unless some mechanism is employed to multiply the movement produced by the opening and closing of the door. I have, therefore, introduced the levers V and the segment S, which acts as a lever, with short and long arms so that a short movement of the arm of the lever V which is outside of the fulcrum W, will insure a long movement of the segmental rack S, and its connected parts.

In order to employ the same apparatus as a call bell to be operated by hand from the outside of the door, I have shown a ratchet wheel a fixed upon the central spindle c, and inside of the raised portion of the plate A, or between it and the door. This ratchet has a pawl b which engages it when turned in one direction and moves freely over its teeth when moved in the opposite direction. The position of this ratchet and pawl is such that when the alarm mechanism is acting, this portion of the apparatus is not acted upon. When, however, it is desired to operate the bell as a call it is done by means of a spindle or shaft 0 which passes through the door, and has a suitable turning handle (1 upon the outside. When this handle is turned, the pawl b which is pivoted upon the disk e fixed to the spindle C will, by its engagement with the teeth of the ratchet, turn the disk e and spindle G, and through it will actuate the escapement wheel and the hammer, but this mechanism is inoperative while the alarm mechanism is being acted on by reason of the ratchet wheel and pawl as before described.

In Fig. 3 I have shown the device so ar ranged that the bell is fixed at or near the center part of the door, and in this case the lever V is fulcrumed near the edge of the door and is connected withthe bell mechanism by a red X. This rod is provided with offsets or steps, as shown at f, and these are engaged by a pawl 9, so that by engaging it with one of these steps, the rod is so held that the alarm will not be operated at all. By engaging it with another of the steps, the length of time which the alarm operates will be shortened, and the alarm may thus be made to act for a longer or shorter time.

WVhen applied to a window sash, as shown in Figs. 4 and 5, it will be manifest that it will operate in the same manner as when applied to a door. The end of the lever V will be forced back by' striking the seat when the window is closed, and will be released when the window is opened.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an alarm bell, a gong, a hammer, and an escapement by which the hammer is actuated to strike the gong, an escapement wheel mounted upon a central shaft, gears by which said wheel is turned in one direction, a ratchet mechanism by which the main gearing is connected with a pinion when turned in one direction and the pinion is allowed to move freely in the opposite direction, a segmental rack lever engaging said pinion, a. diagonally fulcrumed lever fulcrumed between its opposite ends, having one of said ends connected with the rack lever and the opposite end adapted to engage the door jamb whereby said segmental rack is moved when the door is closed, and a spring by which the rack is returned and the escapement is retated so as to operate the hammer when the door is opened.

2. The combination in an alarm bell of a gong, a hammer, and an escapement by which said hammer is caused to continuouslystrike the gong, a pinion mounted upon the shaft of the escapement wheel, a gear engaging said pinion, a ratchet and pinion turnable together and a. spring pawl fulcrumed upon the gear to engage the ratchet when turned in one direction, and allow it to move freely in the opposite direction, a segmental rack engaging the pinion of the ratchet and fulcrumed at one side of the bell plate, a diagonally arranged lever fulcrumed between its opposite ends having one end connected with the arm of the rack, and the other engaging the door jamb whereby the motion of the parts is multiplied, and the segmental rack lever is actuated so as to turn the pinion and ratchet inone direction without moving the gear, a spring connected with the segmental rack lever whereby it is returned to its normal position and the gear and escapement mechanism are actuated.

3. The combination of an alarm bell and gong having a hammer, and escapement by which said hammer is caused to continuously strike the gong, a lever movable by the closing of the door, andasegmental rack, pinion,

and ratchet, and gearing whereby the movement of the rack acts upon the escapement to actuate the hammer, a spindle passing through the door having a handle upon the outer end by which it may be turned, and a pawl and ratchet mechanism connected with said spindle whereby it is connected with the escapement mechanism when the handle is turned in one direction, and the bell is sounded independent of the alarm mechanisms to In witness whereof I have hereunto set my hand,

J OI-IN T. STONE.

Witnesses:

S. H. NoURsE, J. A. BAYLESS. 

